This is absolutely correct. There really is no single definition of unschooling and even homeschooling. I know families that say they "homeschool" their kids,

This is absolutely correct. There really is no single definition of unschooling and even homeschooling. I know families that say they "homeschool" their kids, yet those kids attend an "academy" three days a week that provides the curriculum, teaching, and homework. The parents really just make sure the kids do their work. This is very distinct from what my wife and I did -- pulling together a curriculum ourselves, and doing 75% of the teaching.